/*
* Copyright 2014 Netflix, Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package io.reactivex.netty.metrics;
import io.netty.buffer.ByteBuf;
import io.netty.buffer.ByteBufHolder;
import io.netty.channel.ChannelDuplexHandler;
import io.netty.channel.ChannelFuture;
import io.netty.channel.ChannelFutureListener;
import io.netty.channel.ChannelHandler;
import io.netty.channel.ChannelHandlerContext;
import io.netty.channel.ChannelPromise;
import io.netty.channel.FileRegion;
import io.reactivex.netty.channel.ChannelMetricEventProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* @author Nitesh Kant
*/
@ChannelHandler.Sharable
public class BytesInspector extends ChannelDuplexHandler {
private static final Logger logger = LoggerFactory.getLogger(BytesInspector.class);
@SuppressWarnings("rawtypes")private final MetricEventsSubject eventsSubject;
private final ChannelMetricEventProvider metricEventProvider;
public BytesInspector(@SuppressWarnings("rawtypes")MetricEventsSubject eventsSubject, ChannelMetricEventProvider metricEventProvider) {
this.eventsSubject = eventsSubject;
this.metricEventProvider = metricEventProvider;
}
@Override
public void channelRead(ChannelHandlerContext ctx, Object msg) throws Exception {
try {
if (ByteBuf.class.isAssignableFrom(msg.getClass())) {
publishBytesRead((ByteBuf) msg);
} else if (ByteBufHolder.class.isAssignableFrom(msg.getClass())) {
ByteBufHolder holder = (ByteBufHolder) msg;
publishBytesRead(holder.content());
}
} catch (Exception e) {
logger.warn("Failed to publish bytes read metrics event. This does *not* stop the pipeline processing.", e);
} finally {
super.channelRead(ctx, msg);
}
}
@Override
public void write(ChannelHandlerContext ctx, Object msg, ChannelPromise promise) throws Exception {
try {
if (ByteBuf.class.isAssignableFrom(msg.getClass())) {
publishBytesWritten(((ByteBuf) msg).readableBytes(), promise);
} else if (ByteBufHolder.class.isAssignableFrom(msg.getClass())) {
publishBytesWritten(((ByteBufHolder)msg).content().readableBytes(), promise);
} else if (FileRegion.class.isAssignableFrom(msg.getClass())) {
publishBytesWritten(((FileRegion) msg).count(), promise);
}
} catch (Exception e) {
logger.warn("Failed to publish bytes write metrics event. This does *not* stop the pipeline processing.", e);
} finally {
super.write(ctx, msg, promise);
}
}
@SuppressWarnings("unchecked")
protected void publishBytesWritten(final long bytesToWrite, ChannelPromise promise) {
final long startTimeMillis = Clock.newStartTimeMillis();
eventsSubject.onEvent(metricEventProvider.getWriteStartEvent(), (Object) bytesToWrite);
promise.addListener(new ChannelFutureListener() {
@Override
public void operationComplete(ChannelFuture future) throws Exception {
if (future.isSuccess()) {
eventsSubject.onEvent(metricEventProvider.getWriteSuccessEvent(),
Clock.onEndMillis(startTimeMillis), bytesToWrite);
} else {
eventsSubject.onEvent(metricEventProvider.getWriteFailedEvent(),
Clock.onEndMillis(startTimeMillis), future.cause(), bytesToWrite);
}
}
});
}
@SuppressWarnings("unchecked")
protected void publishBytesRead(ByteBuf byteBuf) {
if (null != byteBuf) {
eventsSubject.onEvent(metricEventProvider.getBytesReadEvent(), (Object) byteBuf.readableBytes());
}
}
}